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    SubjectRe: Support multiply-LUN devices in ub
    On Sun, May 01, 2005 at 09:24:38PM -0700, Pete Zaitcev wrote:
    > On Sun, 1 May 2005 21:05:05 -0700, Matthew Dharm <mdharm-kernel@one-eyed-alien.net> wrote:
    > > On Sun, May 01, 2005 at 04:05:40PM -0700, Pete Zaitcev wrote:
    >
    > > > /*
    > > > + * This many LUNs per USB device.
    > > > + * Every one of them takes a host, see UB_MAX_HOSTS.
    > > > */
    > > > +#define UB_MAX_LUNS 4
    > >
    > > Why only 4 LUNs?
    >
    > This can be redefined at any moment, fortunately, so there's no need to
    > agonize over this number. There is no backward or forward compatibility
    > problem. The sole purpose of that limit is to make a probe loop bound,
    > for initial testing.
    >
    > Why would you want more though? I have a 12-in-1 reader which only
    > exports 4 LUNs. If someone attached enterprise storage arrays to USB,
    > it might be a good idea to remove the limit completely.

    I've seen 5 and 6 LUNs, but they aren't common.

    The best reading of the specs suggest that 8 is the practical limit.

    Since that's not far from 4, perhaps it would be best to set the number to
    8 so we never have to revisit it again.

    Matt

    --
    Matthew Dharm Home: mdharm-usb@one-eyed-alien.net
    Maintainer, Linux USB Mass Storage Driver

    Hey, has anyone seen the Microsoft sales guy? It's his feeding time...
    -- Mike
    User Friendly, 4/17/1998
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